I'm not 100% sure about this. But my gut feeling is that two moves are twice as hard on them as one move. Unless spread out over probably many weeks to be sure. Like I said though, not really sure myself on that one.
Do you have lights for your QT? I'm just wondering if you could set that up at the new place beforehand and move the clam into there while you're then able to take your time on the other tank move. If not what about just a bucket with an airstone and a heater for the few hours it might take?
Man what a dilemma.
